Ok, I have ordered a four RT5370-USB adapters. 

I am building a distributed wireless audio with shairport that will operate 4 nodes outdoors, plus a laptop. It will be running on four Rasp-Pi Zero W, each equipped with a audio amplifier and Wifi-mesh through this external adapter. The on-board WiFi could be used as an access-point.

So, Am I on the right track?

Fabien

2018-07-11 5:04 GMT-04:00 Daniel Golle <daniel@makrotopia.org>:

On Tue, Jul 10, 2018 at 10:20:53PM -0400, Fabien Gagné wrote:
> Hi,
>
> I'd like to LibreMesh a few RaspberyPi Zero W.
>
> Which USB network interfaces are compatible for mesh ?

None. USB wifi is always shit. There haven't ever been really useful
USB WiFi dongles for several reasons. The closest it gets to are
ath9k_htc based dongles, but even those have only very limited support
for AP/Mesh/Ad-Hoc (limited to max. 6 neighbours/AP-clients, with more
behaviour starts to be weird/undefined).
Some Ralink rt2800usb based dongles also somehow work, but they perform
worse than those ath9k_htc ones. RealTek stuff is acceptable for STA
client mode, but that's it. MediaTek MT76x0U may become more useful
in future (driver development is ongoing). Did I forget anything?

> I'd like one with a removable antenna.

Honestly: Wrong platform. Use something with mPCIe or hard-wired PCIe
radios, ideally ath9k or mt76x2e.

>
> Thanks,
>
> Fabien
> Canada

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